Reenforced plaster wall board



Patented Apr. 30, 1929;

UNITED STATES, PATENT OFFICE.

CHARLES R. BIRDSEY, OF HINSDALE, ILLINOIS, ASSIGNOR T UNITED STATES GYP-SUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

REENIEOBCED PLASTER WALL BOARD.

Original application filed January 13, 1921, Serial No. 437,062, nowPatent No. 1,643,801, dated September 27, 1927. Divided and thisapplication filed April 19, 1922. Serial 1W0. 555,627.

My invention belongs to that general class of inventions relating to theproduction of plaster board or plaster wallboard and more particularlyto an improved reenforced plaster wallboard, the method and apparatusfor producing which is set forth in my prior application Serial No.437,062, filed January 13, 1921, Patent No. 1,643,801, Sept. 27, 1927and of which this is a divisional application.

The invention has among its objects the production of an improvedwallboard, the edges of which are reenforced to prevent the crumbling orbreaking away of the plaster body between the cover sheets.

To this end my invention consists 1n the novel construction, arrangementand combination of parts herein shown and described, and moreparticularly pointed out in the claims. v

In the drawings, wherein like reference characters indicate like orcorresponding )ZUtS- I Figure 1 is a view in perspective, with partsbroken away, of my improved board showing the longitudinal andtransverse ed es.

Figure 2 is a sectional view, ta en transversely through the board, withparts broken away, illustrating the reenforced edges.

Plaster boards of various types-have been heretofore manufactured, somewith what may be termed"raw or unbound edges, and others with boundedges, the board proper consisting of a body of plaster or like materialprovided with covering sheets on the two faces. Some types of boardshave been manufactured in which sheets are imbedded in the body or thebody made up of alter nate sheets of imbedded covering material andplaster. A distinction is now being made. between plaster board, whichtakes the place of laths and'must receive a coat of plaster beforepapering or painting and plaster wallboard which taikes the place ofboth laths and plaster that maybe nailed in place and be ready toreceive a coat of paint or be papered. Among the requisites of plasterwallboard are uniformity ofthickness, uniformity of width, anduniformity of the longitudinal edges, so that when the wallboards arenailed to the studding an even outer surface ispresented.

In carrying out this invention, the plaster,

or like mater1al,'body1 is contained between the cover sheets 2 and 3 ofpaper or fibrous material with the longitudinal edges raw or unbound.\Vhile it is preferable to provide cover sheets of the exact widthdesired to produce a board of uniform width, it is not essential to thisinvention which relates particularly to the reenforcement of the edges.

The paper or fibrous cover sheets give the tensile strength to the boardand when nails are driven through the covering and body adj acentthe'longitudinal edges, as is necessary to secure the board to thestudding, the body being frangible will break or crumble at the openedges between the cover sheets which weakens the attachment to thestudding, also during transportation blows received on or near the edgeswill produce the same result, so that the abutting edges of the boardwhen in place will be uneven. 'To overcome this defect in the raw edgeboard and prevent this crumbling of the body, one or more strengtheningstrips ofpaper or fibrous material, preferable of the same character asthe cover sheets, are provided in the body between the cover sheets. Asillustrated, two of the strips 4 and 5 are preferably employed which areimbedded in the body and extend from the exterior of the edges of thebody a sufficient distance towards the center to hold the bod togetherwhen a nail is driven there throu h the adjacent edge and reenforce itto resist blows or shocks received during handling and transportation.

Since the plaster or' like material formmg the body adheres or bonds tothe cover sheets and the inserts or reenforcing strips are of likematerial the body will adhere or. bond to them so that from top tobottom sheet there will be along each longitudinal edge alternate layersof fibrous material separated by alternate layers of plaster or likematerial. While the edges of the board are reenforced, yet the main bodyof the board is not 'divided or separated as. in the case of wide sheetsinserted between the cover sheets, the portions of each cover sheetbetween the inserts or strips at the edges being connected with the bodyand throu h the medium of the body to each other. may be termed awallboard in the true sense as the reenforcement at the edges insuresuniformity of the edges and a slight crumbling is reenforced plasterboard i of. the body between any of the reenforcing rial between thefacing sheets only at the side edges of the board, for the purposespecified.

2. A fabricated board comprising a body of plastic material and facingsheets of fibrous material, and having independent narrow insets offibrous material and plastic material between the faoing sheets only atthe side edges of .the board for the purpose specilied, said insetsbeing composed of alternate narrow strips of fibrousmaterial andplaster.

3. A plaster board comprising a plaster body having covering sheets ateach side therof, and independent, segregated reenforeing stripsimbedded in the body at the edges thereof between said covering sheets.

4- A plaster board comprising a plaster body having covering sheets ateach side thereof, and a plurality of independent reenforcing stripsimbedded in the body at each of the side edges thereof between saidcovering sheets.

5. A plaster board comprising a body of plastic material and coversheets of fibrous material bonded to the body on opposite sides thereof,and having independent narrow reenforcing strips of fibrous'materialextending inward from the edges into the body of plastic material andbonded thereto sepa-' rated from each other and from the cover sheets bya substantial amount of the plastic material forming the body.

6. A fabricated hoard comprising a body of plastic material havingfacing sheets of lilarous material. and having independent insets oflibrous material between the facing inwardly from the edges into thebody of plastic material and separated from the cover sheets by layersof plaster.

CHARLES R. BIRDSEY.

